As part of our transition of display ads to HTML5, the Swiffy Flash conversion tool is no longer
available. We will continue to serve the Swiffy runtimes, so any files you have already converted
will continue to play.

Today more consumers are using the web in HTML5 compatible environments
than Flash-compatible environments. In order to reach as large an audience
as possible, we encourage everyone to transition to HTML5 authoring.

Developers who currently create Flash SWF files have several ways to
switch to HTML5 including
Adobe Animate
and
Google Web Designer.
If you need to play an existing Flash SWF file in your browser alone, you
might be able to use Mozilla’s Shumway.